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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '623c27c58e9c2c891a830d3fd04aa51f80e2eb6b02bfa22600da99f3b18a9526' 
  AND token = 'G+KApZPFXAeZ+VBbsEM7+6rajozxQNJQtWXBG42fMAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}